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JEE Main 20172 April
Exam
JEE Main
Year
2017
Date
2 April
Subject
Physics
Chapter
Communication System

JEE Main 2017 · 2 April · Physics · Communication System

In amplitude modulation, the sinusoidal carrier frequency used is...

In amplitude modulation, the sinusoidal carrier frequency used is denoted by ωc{\omega}_{c} and the signal frequency is denoted by ωm{\omega}_{m} . The bandwidth (Δωm)\left(\Delta{\omega}_{m}\right) of the signal is such that Δωm≪ωc\Delta{\omega}_{m} ≪ {\omega}_{c}. Which of the following frequencies is not contained in the modulated wave?In amplitude modulation, the sinusoidal carrier frequency used is denoted by ω _ c and the signal frequency is denoted

Options

  1. Aωc−ωm{\omega}_{c} - {\omega}_{m}
  2. Bωm{\omega}_{m}
  3. Cωc{\omega}_{c}
  4. Dωm+ωc{\omega}_{m} + {\omega}_{c}

Correct answer

B. ωm{\omega}_{m}

Step-by-step solution

∵∵ Δωm≪ωc\Delta{\omega}_{m} ≪ {\omega}_{c}

ωm{\omega}_{m} will not be there in the frequencies.

In modulated wave

In amplitude modulation, the sinusoidal carrier frequency used is denoted by ω _ c and the signal frequency is denoted
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